基于恒位移控制的鋼軌氣壓焊溫度場特征研究.pdf

1、西南交通大學碩士學位論文基于恒位移控制的鋼軌氣壓焊溫度場特征研究姓名：陳麗申請學位級別：碩士專業(yè)：材料科學與工程指導教師：戴虹201205●AbstractCWRtrack(Continuousweldedrailtrack)isanimportantsymbolofrailstructuretechnologicalprogress，inordertofurtherimprovetrainsafetycomfortandspeed，i

2、tneedstoimprovethequalityofrailweldingjointTheweldingtemperatureisthemostimportantfactorstoqualityofrailweldingjoint，theresearchoftemperaturefieldofGPW(gaspressurewelding)hasgreatsignificanceIntheheatingprocessofGPWtheth

3、ermalstressofrailjointsgeneratedbythethermalexpansionremovetheinfluenceoftheexternalenvironment，andonlybytheinfluenceoftemperaturefield，SOthethermalstressandthetemperaturefield，therearecertainphysicalrelationshipThispape

4、rbases011constantdisplacementcontroltechnologyofGPWstatisticsandanalysisthecollecteddataofrailjointsindifferentelevations，collectsthecorrespondingrelationshipbetweenholdingpressureandtime，indirectanalysisthecorresponding

5、relationshipbetweenequivalenttemperatureandtime，AnalyzingthechangeruleofdataindifferentaltitudesUsingANSYSsimulatesoftware，andcarryoutthesimulatedresearchofrailweldingjoints’temperaturefield，simulatingthetemperaturefield

6、distributionofrailjointanddrawingtheequivalenttemperature一timecurveofdifferentpartsinweldingfaceThesimulatedresultsandactualcollectionresultsarecompared，analysistheidenticalsituationToexploreanewmethodofindirectmeasureme

7、ntandvaluationofweldingtemperaturefieldcharacteristics，improvetherailweldingtechnologyandequipmentlevel，reduceweldingcosts，improveandperfecttheweldingprocessofGPWconstantdisplacement，isofgreatsignificanceResultsshowthatt

8、heconstantdisplacementqualitycontrolmethodofGPWtheprocessofweldingheatingwithtemperaturerising，railexpands，pressuresensorscollectthechangeruleofholdingpressurewhichpresentfirstincreasesthendecreases，Nomatterthealtitudes，

9、itsholdingpressurechangerulesareconsistentgoodThroughpressuresensorofGPWmachinecollecttherelationshipofthepressureandtime，themethodwhichusingtherelationshipofthepressureandtimemonitorequivalenttemperaturefieldisfeasiblea